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ASBESTOS (bulk): METHOD 9002, Issue 2, dated 15 August 1994 - Page 9 of 9 Table 1. Optical Properties of Asbestos Fibers (Continued) Central Stop Dispersion Staining Colors

Parallel to fiber length

+ (length slow)

1.550 HD

Blue

Blue-magenta

Parallel to fiber length

+ (length slow)

1.670

Red magenta to blue

Yellow

Fibers subjected to high temperatures will not dispersionstain. 1.680 1.680

pale blue blue

blue gold

1.700

Red magenta

Blue-magenta

yellow

pale yellow

Blue

Gold to goldmagenta

Blue-green

Golden-yellow

Pale blue (tremolite)

Yellow (tremolite)

Yellow (actinolite)

Pale yellow (actinolite)

Chrysotile CummingtoniteGrunerite (Amosite)

Cummingtonite Grunerite Parallel to fiber length

- (length fast)

1.680 Anthophyllite

Parallel to fiber length

+ (length slow)

1.605

HD

1.620 HD TremoliteActinolite

5 to Vibration

RI Liquid

Extinction

Crocidolite (Riebeckite)

  • to

Vibration

Sign of Elongation

Mineral

Oblique - 10 to 20E for fragments. Some composite fibers show 5 extinction.

+ (length slow)

1.605

HD

HD = high-dispersion RI liquid series.

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94

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